# physics

A law enforcement officer in an intergalactic "police car" turns on a red flashing light and sees it generate a flash every 1.5 s. A person on earth measures that the time between flashes is 2.9 s. How fast is the "police car" moving relative to the earth?

1. 👍
2. 👎
3. 👁
1. Solve this equation for v:

2.9 = 1.5 / sqrt [1 - (v/c)]^2

c is the speed of light.

This is one of Einstein's relativity equations

1. 👍
2. 👎
2. 0.8c

1. 👍
2. 👎

## Similar Questions

1. ### physics(kinematics)

A police officer in a patrol car parked in a 70 Km/h speed zone observes a passing automobile might be intoxicated,the officer starts his car,accelerates uniformly to 90 Km/h in 8s ,and maintaining a constant velocity of 90

2. ### physics

The car stationary in front of a red traffic light. As the light turns green , a truck goes past at a constant velocity of 1.5 m/s. At the same moment , the car begins to accelerate at 1.25 m/s 2 . When it reaches 2.5 m/s the car

3. ### PHYSICS

You are driving your car and the traffic light ahead turns red. You applied the brake for 3.00 seconds and the velocity of the car decreases to 4.50 m/s. The car's deceleration has a magnitude of 2.70 m/s^2 during this time. What

4. ### Physics

Please Help!!! A 920 kg sports car collides into the rear end of a 2300 kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.5 m before stopping. The police officer, knowing that

1. ### Calculus 1

A police car is located 60ft to the side of a straight road. A red car is driving in the direction of the police car and is 90 ft up the road from the location of the police car. The police radar read that the distance between the

2. ### Physics.

An unmarked police car traveling a constant 95 km/h is passed by a speeder traveling 120 km/h. Precisely 1.00 sec. after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 1.90

3. ### Criminology

What is a police officer who works inside of a school called? (Select all that apply.) school resource officer school liaison officer school-based police office school enforcer I think its A, B?

4. ### physics

A motorist drives along a straight road at a constant speed of 15.0 m/s. just as she passes a parked police officer,the officer starts to accelerate at 2.00 m/s^2 to overtake her. assuming the officer maintains this acceleration,

1. ### Physics

An unmarked police car traveling a constant 85.0 km/h is passed by a speeder traveling 130 km/h . Precisely 3.00 s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 2.30

2. ### Criminal precedure

Question 11 of 20 5.0 Points Under the Fourth Amendment, which of the following is NOT a valid purpose for setting up a roadblock? A. Immigration law enforcement B. Detecting drunk drivers C. Checking for drivers licenses and

3. ### Physics

Two bank robbers 1are in their get-way car traveling at it's top speed of 30m/s. They drive by a parked pollice officer who was on the lookout for them. If the police officer takes 2 seconds to react and engage in pursuit , how

4. ### Physics

To save fuel, some truck drivers try to maintain a constant speed when possible. A truck traveling at 110.0 km/hr approaches a car stopped at the red light. When the truck is 211.7 meters from the car the light turns green and the